package com.zzj.ecology.framework.interceptor.impl;

import com.alibaba.fastjson.JSON;
import com.zzj.ecology.framework.interceptor.RepeatSubmitInterceptor;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;

/**
 * @ClassName SameUrlSubmitInterceptor
 * @Description TODO
 * @Author zhijun zeng at 22:27 2020/4/13
 * @Version 1.0
 **/
@Component
public class SameUrlSubmitInterceptor extends RepeatSubmitInterceptor {

    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";

    public final String SESSION_REPEAT_KEY = "repeatData";

    /**
     * 间隔时间，单位:秒 默认10秒
     *
     * 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
     */
    private int intervalTime = 10;

    public void setIntervalTime(int intervalTime) {
        this.intervalTime = intervalTime;
    }

    @Override
    public boolean isRepeatSubmit(HttpServletRequest request) throws Exception {

        String currParams = JSON.toJSONString(request.getParameterMap());
        Map<String, Object> currDataMap = new HashMap<String, Object>();
        currDataMap.put(REPEAT_PARAMS, currParams);
        currDataMap.put(REPEAT_TIME, System.currentTimeMillis());

        // 请求地址（作为存放session的key值）
        String url = request.getRequestURI();

        HttpSession session = request.getSession();
        Object sessionObj = session.getAttribute(SESSION_REPEAT_KEY);

        if (sessionObj != null) {
            Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
            if (sessionMap.containsKey(url)) {//
                Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
                if (compareParams(currDataMap, preDataMap) && compareTime(currDataMap, preDataMap)) {
                    return true;
                }
            }
        }
        // 如果不存在 ,则创建一个,并返回false,表示非重复提交
        Map<String, Object> sessionMap = new HashMap<String, Object>();
        sessionMap.put(url, currDataMap);
        session.setAttribute(SESSION_REPEAT_KEY, sessionMap);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
        String nowParams = (String) nowMap.get(REPEAT_PARAMS);
        String preParams = (String) preMap.get(REPEAT_PARAMS);
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap) {
        long time1 = (Long) nowMap.get(REPEAT_TIME);
        long time2 = (Long) preMap.get(REPEAT_TIME);
        if ((time1 - time2) < (this.intervalTime * 1000)) {
            return true;
        }
        return false;
    }
}
